Comments on: How To Fix The DirectX Rasterisation Rules

By: Rasmus

Rasmus — Mon, 27 Jul 2009 21:21:49 +0000

Oh, I see. Thanks!

By: Simon Brown

Simon Brown — Mon, 27 Jul 2009 19:23:19 +0000

The shader code corrects for this in post-projective space, where x and y are in the range [-1, 1]. So an offset of 1/width and 1/height do actually correct by half a pixel.

It’s worth noticing that this was fixed in DirectX 10 by the way. I can’t find anything on the change in MSDN, but this AMD article mentions it: http://developer.amd.com/documentation/articles/Pages/7112007172.aspx

By: Rasmus

Rasmus — Mon, 27 Jul 2009 09:57:21 +0000

Hi,

Thanks for this article. I am however a bit confused about one point. In your drawing and the text you indicate that the quad is off by half a pixel. But your shader code corrects the position by a whole pixel. Which one is it? Or am I overlooking something?

By: Post Processing/Fullscreen Texture Sampling | The Instruction Limit

Post Processing/Fullscreen Texture Sampling | The Instruction Limit — Fri, 12 Jun 2009 01:35:57 +0000

[...] demo adresses the simple cases. I very recently found a more proper way to address this problem in a 2003 post from Simon Brown. I tested it and it works, but I don’t feel like updating the demo. [...]